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Papermaking wastewater treatment and reuse process

A technology of papermaking wastewater and process, which is applied in the field of papermaking wastewater treatment and reuse technology, can solve the problems of ultrafiltration device fouling and short service life of ultrafiltration membrane, and achieve the effect of high removal efficiency

Active Publication Date: 2015-05-06
ZHEJIANG DONGYANG ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution may cause fouling of the ultrafiltration device, requiring frequent manual chemical cleaning, and the ultrafiltration membrane has a short service life.

Method used

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  • Papermaking wastewater treatment and reuse process
  • Papermaking wastewater treatment and reuse process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 As shown, the papermaking wastewater treatment and recycling process includes a wastewater collection pool 2 for collecting papermaking wastewater, and the wastewater collection pool 2 is connected with an aerobic pool 3, a high-efficiency air flotation pool 4, a hydrolysis pool 5, and an A / O pool 6 in sequence. A lifting pump 0 is arranged between the wastewater collection pool 2 and the regulating and aerobic pool 3, a lifting pump 0 is arranged between the regulating and aerobic pool 3 and the high-efficiency air flotation pool 4, and the A / O pool 6 is connected with a sedimentation tank 7, Biochemical wastewater collection pool 8, multimedia filter 9, bag filter 10 and first circulation system 11; The first circulation system 11 comprises the ultrafiltration device 111 and circulation pump 112 that form inner circulation loop; Ultrafiltration device 111 is connected respectively There is an ultrafiltration backwash pump 121 and an ultrafiltration water...

Embodiment 2

[0040] Same as Example 1, the difference is that the ultrafiltration device performs automatic backwashing every half an hour; the flushing flux is controlled at 120L / m2 hr; the backwashing pressure is ≤0.2MPa; the backwashing time is 40 seconds; the ultrafiltration device is an external Press-type hollow fiber membrane, the ratio of the inner and outer diameter of the membrane filament is 1: 2.5, and the packing density of the ultrafiltration module is 1200m 2 / m 3 . The total residence time of the adjusted facultative oxygen tank 3 is 28h, including the adjustment time of 10h and the facultative oxygen time of 18h; the residence time of the hydrolysis tank 5 is 14h. The residence time of the anaerobic process in the A / O tank 6 is 1.2h; the surface load of the sedimentation tank 7 is 0.6m3 / m2.h.

Embodiment 3

[0042] According to the characteristics of high concentration and changeable water quality of industrial wastewater in serious pollution industries such as electroplating, leather, chemical industry, and papermaking, combined with the practical experience of high-concentration industrial wastewater treatment, it is advisable to adopt a treatment process combining physicochemical, biochemical, and membrane methods. It is divided into two parts: biochemical system and reuse system.

[0043] Biochemical treatment considers the comprehensive process of regulating tank + high-efficiency air flotation + hydrolysis tank + A / O tank + sedimentation tank. The industrial wastewater enters the collection pool, and is pumped into the regulating and aerobic pool through the lifting pump. A grid well is set in front of the regulating pool to remove the coarse, long, and particles in the wastewater. In order to alleviate the impact of changes in wastewater volume and COD concentration, a larg...

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Abstract

The invention relates to a wastewater treatment system and particularly relates to a papermaking wastewater treatment and reuse process. An adjusting facultative tank, an efficient air flotation pool, a hydrolytic pond and an A / O pool are sequentially connected behind a wastewater collecting pool; a lifting pump is arranged between the adjusting facultative tank and the efficient air flotation pool, and a settling pond, a biochemical wastewater collecting pool, a multi-medium filter, a bag type filter and a first circulating system are sequentially connected behind the A / O pool; the first circulating system comprises an ultrafiltration device and a circulating pump forming an internal circulating loop; the ultrafiltration device is respectively connected with an ultrafiltration backwashing pump and an ultrafiltration water yielding pool; a high pressure pump, a membrane concentration device, a concentrated water pool and a filter backwashing pump are sequentially connected behind the ultrafiltration water yielding pool; the outlet of the filter backwashing pump is communicated with the multi-medium filter; the multi-medium filter, the first circulating system, a second circulating system, the high pressure pump, the membrane concentration device, the concentrated water pool and the filter backwashing pump form a third circulating system of the circulating loop. The process provided by the invention can be used for efficiently removing COD, chromaticity and suspended solids and reducing pollution on the ultrafiltration membrane.

Description

technical field [0001] The invention relates to a wastewater treatment system, in particular to a papermaking wastewater treatment and recycling process. Background technique [0002] Since the "Twelfth Five-Year Plan", the research on key emission reduction technologies related to electroplating, leather, chemical industry, papermaking and other heavily polluting industries has become more and more in-depth. In the process of the above-mentioned industries, waste gas, waste water, and waste resource recovery and utilization technologies have become relevant. One of the research focuses of researchers in the field. The components of production wastewater in these industries are generally relatively complex, with a wide variety of pollutants, usually with high CODcr, BOD 5 High, high SS concentration, NH 3 It is one of the most difficult industrial wastewater to treat due to the characteristics of high N concentration and high chroma. [0003] Generally, the traditional ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/24C02F1/441C02F1/444C02F3/30C02F9/00C02F2103/28C02F2301/08
Inventor 刘辉叶婷婷陆斌王峰
Owner ZHEJIANG DONGYANG ENVIRONMENTAL ENG